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Patient-ventilator dyssynchrony detection

  • US 10,137,266 B2
  • Filed: 01/22/2010
  • Issued: 11/27/2018
  • Est. Priority Date: 02/25/2009
  • Status: Active Grant
First Claim
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1. A method of detecting dyssynchrony between a patient and a pressure support system, comprising:

  • receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system;

    obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and

    analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchrony for the breath and outputting a dyssynchrony indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchrony is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the number of predetermined criterion includes all of;

    (i) a number of volume qualified flow slope reversals in the patient flow data for the breath exceeding a predetermined number;

    (ii) an incremented tidal volume during at least a portion of an expiratory phase of the breath as indicated by the I/E state signal exceeding a predetermined positive value;

    (iii) an absolute value of a tidal volume during the breath exceeds a predetermined value; and

    (iv) a tidal volume during an inspiratory phase of the breath as indicated by the I/E state is less than a predetermined negative value.

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